package com.lagou.client;

import com.alibaba.fastjson.serializer.JSONSerializer;
import com.lagou.util.*;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class RpcConsumer {
    //创建线程池对象
    private static ExecutorService executor =
            Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private static UserClientHandler userClientHandler;
    //1.创建一个代理对象  providerName: UserService#sayHello
    public Object createProxy(final Class<?> serviceClass){
        //借助JDK动态代理生成代理对象
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class<?>[]{serviceClass}, new InvocationHandler() {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //(1) 调用初始化netty客户端的方法
                if (userClientHandler ==null){
                    initClient();
                }

                //组装RpcRequest对象
                RpcRequest rpcRequest = new RpcRequest();
                rpcRequest.setRequestId("1");
                rpcRequest.setClassName("com.lagou.service.UserServiceImpl");//UserService
                rpcRequest.setMethodName("sayHello");
                Object[] paraObjArr ={args[0]};
                rpcRequest.setParameters(paraObjArr);
                Class[] paraTypeArr ={String.class};
                rpcRequest.setParameterTypes(paraTypeArr);

                //设置参数
                //userClientHandler.setPara(providerName+args[0]);
                userClientHandler.setPara(rpcRequest);

                //去服务端请求数据
                return executor.submit(userClientHandler).get();
            }
        });
    }

    //2.初始化netty客户端
    public static void initClient() throws InterruptedException {
        userClientHandler = new UserClientHandler();

        EventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
                        //pipeline.addLast(new StringEncoder());
                        //pipeline.addLast(new StringDecoder());
                        pipeline.addLast( new RpcEncoder(RpcRequest.class, new JSONSerializerZDY()));
                        pipeline.addLast( new RpcDecoder(RpcResponse.class, new JSONSerializerZDY()));
                        pipeline.addLast(userClientHandler);
                    }
                });

        bootstrap.connect("127.0.0.1",8990).sync();
    }
}
